Back pain, more often than not, is caused by postural issues and your body using the wrong muscles, or aligning the spine wrong, putting undue stress on some pa

Back pain, more often than not, is caused by postural issues and your body using the wrong muscles, or aligning the spine wrong, putting undue stress on some parts of it instead of distributing it more evenly. Yes, walking is protective and beneficial, but if your posture is bad enough, your body is going to engage in the same compensations and it can worsen your pain and hurt you. See a physiotherapist, or at the absolute least watch some postural restoration content on YouTube - most often, people have weak deep abdominal muscles, glutes, and hip internal rotation.